Protective device for electric control circuits

Details Protective device for electric control circuits Protective device for electric control circuits

1990-03-15

1992-06-23

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 91, 307127, 323301, H02H 326

Patent

active

051248743

ABSTRACT:
A protective device for an electric control circuit having first and second input buses to be applied with a source voltage of low level from a commercially available source of electricity and an electrical load of low rating voltage connected between the input buses. The protective device is in the form of a switchover relay disposed between the input buses and the electrical load for maintaining the electrical load in connection to the input buses when applied with the source voltage of low level and for disconnecting the elecrical load from the input buses when applied with a source of high level from the source of electricity. The operating voltage of the switchover relay is determined to be higher than a maximum allowable voltage of the electrical load and to be lower than a lower limit value of the source voltage of high level.

REFERENCES:
patent: 4068276 (1978-01-01), Pintel
patent: 4837672 (1989-06-01), Donze

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